CN101326761A - Wireless table and method for initiating resource measurement in wireless table - Google Patents
Wireless table and method for initiating resource measurement in wireless table Download PDFInfo
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- CN101326761A CN101326761A CNA200580052234XA CN200580052234A CN101326761A CN 101326761 A CN101326761 A CN 101326761A CN A200580052234X A CNA200580052234X A CN A200580052234XA CN 200580052234 A CN200580052234 A CN 200580052234A CN 101326761 A CN101326761 A CN 101326761A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
- H04L43/0882—Utilisation of link capacity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The present invention relates to a method and a wireless station for initiating radio resource measurements. A wireless station identifies (201) a need for radio resource measurements by a second wireless station despite there is no association between the wireless station and the second wireless station allowing direct radio communication between said stations. The wireless station initiates (202) a request for radio resource measurements by the second wireless station.
Description
Technical field
The present invention relates to the method in air station and the air station.More particularly, the present invention relates to radio resource measures.
Background technology
Radio resource is measured, is promptly received radio signals (for example signal quality) by analyzing and/or collect the performed measurement of business statistics (for example channel utilization) and is used in the radio communications system as for example input of provided for radio resources management decision-making.
The mechanism that the IEEE 802.11k revised edition of IEEE 802.11 standards provides radio resource in IEEE 802.11 wireless lan (wlan)s to measure makes the air station of WLAN can adapt to the radio environment at their places automatically.Other related air station request measurement that air station can be carried out local measurement and be had the direct radio communication of permission to described air station and its.In infrastructure mode, access point (AP) can be measured to another air station in the same basic service sets (BSS) (for example portable or travelling carriage) request radio resource, and vice versa.From group mode, air station can ask the radio resource of other air station in the same independent basic service group (IBSS) to be measured.
In the Universal Mobile Telecommunications System (UMTS) by the 3rd generation partner program (3GPP) regulation, service radio network controller (SRNC) can be ordered the current travelling carriage related with the service radio network controller (being called subscriber equipment (UE) again) to carry out radio resource and be measured.Radio network controller (RNC) also can ask its related radio base station to carry out the radio resource measurement.
Summary of the invention
The present invention at problem provide for the improvement of the communication condition that relates to air station (for example radio environment of air station) and understand.
Solve this problem by described method of claim 1 and the described air station of claim 8.
An advantage provided by the present invention is to understand for the improvement of the communication condition that relates to air station.For example can use this information to optimize near the radio resource operating position of air station, and/or the improvement performance of the radio communication that relates to air station is provided.
Now with reference to example embodiment of the present invention and with reference to accompanying drawing, the present invention is described in more detail.
Description of drawings
Fig. 1 is the schematic diagram that can advantageously use example wireless electrical communication system of the present invention.
Fig. 2 is the flow chart that illustrates according to basic skills of the present invention.
Fig. 3 is the flow chart that is shown in further detail according to demonstration first embodiment of the inventive method.
Fig. 4 A is the block diagram that schematically illustrates according to demonstration first embodiment of air station of the present invention.
Fig. 4 B is the block diagram that the functional unit of air station among Fig. 4 A is shown.
Fig. 5 is the flow chart that is shown in further detail according to demonstration second embodiment of the inventive method.
Embodiment
Fig. 1 illustrates a non-limiting example can using radio communications system of the present invention.Exemplary radio communication system shown in Figure 1 is IEEE 802.11 wireless lan (wlan)s.WLAN shown in Figure 1 is operated in so-called infrastructure mode, thereby explanation comprises via first basic service sets BSS1 of distributed system DS1 interconnection and the expansion service group ESS1 of the second basic service sets BSS2.The first basic service sets BSS1 comprises the first access point AP1 and three other air station (for example portable or mobile radio station) STA1-STA3, and the second basic service sets BSS2 comprises the second access point AP2 and two other air station (for example portable or mobile radio station) STA4-STA5.
Under this exemplary scenario, two access point AP1 and AP2 and all other air station STA1-STA3 all support the IEEE 802.11k revised edition of IEEE 802.11k standard.The mechanism that the IEEE802.11k revised edition provides the radio resource in IEEE 802.11 WLAN (wireless local area network) to measure makes the air station of WLAN can adapt to the radio environment at their places automatically.Air station can be carried out local measurement and be had other related air station request of the direct radio communication of permission to measure to described air station and its.Therefore, under the sample situation of Fig. 1, the first access point AP1 can ask to carry out the radio resource measurement by other air station STA1-STA3 of the first basic service sets BSS1, vice versa, and the second access point AP2 can ask to carry out the radio resource measurement by other air station STA4-STA5 of the second basic service sets BSS2, and vice versa.
The radio resource measurement of definition comprises in IEEE 802.1k draft version 3.0 provides for example measurement of following measurement report:
Basic report provides the various information relevant with measured channel, for example whether detects radar, Medium Access Control (MAC) Protocol Data Unit, OFDM preamble or other effective power on channel.
Peace and quiet channel estimating report, the time segment of measured channel busy is found in indication in measuring period.
The received power order report is indicated the received power level on the measured channel.
The channel load report provides the ratio that air station is determined the time of channel busy of measuring, i.e. the busy time of physical support sensing or network allocation vector (NAV) indication.
Noise histogram report is indicated non-802.11 energy that are requested channel by when CCA (peace and quiet channel estimating) indication is idle channel being taken a sample.This report is included in the RPI density of in the channel eight regulation RPI (received power indication) level being observed.
Beacon report provides RCPI (receive channel power), BSSID (basic service set identification), beacon interval and based on the additional parameter of detection beacon or probe response.The definite condition that will how to assemble this measurement of report, and determine when beacon report to be sent to the condition of asking air station.
The frame report provides the summary of traffic from an emission address, and comprises quantity, RCPI and BSSID and the emission address of frame.
The STA statistical report, indication is in the variation (in the MIB.dot11 counters table) of specifying measurement STA counter in the duration.
Link measurement report comprises the estimation of link paths loss and link margin.
The present inventor recognizes, wish that air station can be not only measures with the mode that allows direct radio communication other air station request radio resource related with it to described air station, but also do not allow other related air station request radio resource measurement of direct radio communication to described air station and its.
Fig. 2 is the flow chart that illustrates according to basic skills of the present invention.
In step 201, air station identification is for being carried out the needs that radio resource is measured by second air station, although do not exist permission to carry out the related of direct radio communication between described between described air station and second air station.
In step 202, air station is initiated for carried out the request that radio resource is measured by second air station.
Identification do not allow to carry out the related of direct radio communication owing between air station and second air station, do not exist, so can not be considered as second air station current equity side of the direct radio communication of equity based on first air station for the needs of being measured by second air station.But, identification by second air station carry out needs that radio resource measures for example can based on from described air station itself performed or the 3rd air station performed and report to the result that the radio resource of described air station measures and discern second air station.In other embodiments of the invention, identification for example can be based on the air station of second air station being thought described air station had before been carried out direct radio communication with it for the needs that carried out the radio resource measurement by second air station.
In many embodiment of the present invention, the request that radio resource is measured is transmitted into second air station by first air station via at least one intermediate wireless station.In these embodiments, the request that radio resource is measured is transparent at least one intermediate wireless station preferably, that is, at least one intermediate wireless station does not know that it has transmitted the request that radio resource is measured to second air station.
In different embodiments of the invention, described air station for example can be portable or travelling carriage, but it also can be the air station of serving as access point.Similarly, second air station for example can be portable or travelling carriage, but it also can be the air station of serving as access point.
Fig. 3 is the flow chart that is shown in further detail according to first example embodiment of the inventive method.Use first air station, for example the STA1 assessment among current Fig. 1 related with the first access point AP1 among Fig. 1 it whether should change into another access point, for example Fig. 1 in the related sample situation of the second access point AP2 this first example embodiment is described.
In step 301, the first air station STA1 detects the needs for other related access point of assessment.This can by for example make from the first access point AP1, promptly the signal quality of the current access point related with it of the first air station STA1 is reduced to certain below the threshold value and/or make traffic load among the first access point AP1 surpass certain threshold value to trigger.
In step 302, the first air station STA1 discerns other access point, promptly first air station is current not related with it but can therefrom receive the access point of transmission in its current location.When execution in step 302, the first air station STA1 can use initiatively or drive sweep.Air station can scan all IEEE 802.11 channels, perhaps only scans those listed channels from the AP channel reporting that the first access point AP1 receives.In this sample situation, in step 302, the first air station STA1 discerns the second access point AP2 thus.
In step 303, the first air station STA1 is to initiating radio resource measurement request at all access points of step 302 identification.The measurement of asking for example can be the report of basic report or channel load.Usually launch IEEE 802.11k by IEEE 802.11 management frames and measure request.But, because radio resource measurement request must be transmitted into the access point of being discerned via the first access point AP1, so can not use common IEEE 802.11 management frames to transmit radio resource measurement request.Be included in it has been specified in new data frame subtype, the Frame as " management frames " but will measure request (being the frame part of corresponding IEEE 802.11k radio resource measurement request management frames).This makes it possible to use " 3 address " form of IEEE 802.11 Frames to be transmitted into the access point of being discerned via the first access point AP1 request of will measuring from the first air station STA1.Under current sample situation, the first air station STA1 is transmitted into access point AP2 via the first access point AP1 with radio resource measurement request thus.
In step 304, the first air station STA1 responds the measurement request of initiating in step 303 and receives measurement result.Therefore, under current sample situation, the first air station STA1 receives measurement result via the first access point AP1 from the second access point AP2.Even can by the mode similar to the request of measuring with have new data frame subtype, as the Frame of " management frames " and " 3 address " form of IEEE 802.11 Frames, transmit measurement result.
In step 305, the first air station STA1 judges whether wish to change association.Therefore, under this sample situation, the first air station STA1 compares radio, business and the ability characteristics of the first access point AP1 and the second access point AP2.For example, respectively according to the signal to noise ratio snr of the estimation of the first access point AP1 and the second access point AP2
1And SNR
2, the report traffic load rho
1And rho
2And maximum supporting rate R
Max1And R
Max2, effective speed R
EffCan be calculated as:
R
Eff AP=max{BW*log2 (1+SNR
AP/ k), R
MaxAP* (1-rho
AP), for AP=1,2
BW is system bandwidth (being approximately 20MHz for 802.11) in the formula, and k realizes margin constant.K=1 is set produces well-known shannon capacity formula, it is as the upper limit.Therefore, k reflected with idealized system and compared, and needs big what SNR just to reach certain bit rate in reality system.The representative value of k is 2-4 times or 3-6dB.
R with the related first access point AP1
Eff1R with the related second access point AP2
Eff2Compare.If R
Eff2＜=R
Eff1, then the first air station STA1 should keep related with the first access point AP1 (is alternative "No" in step 305).If R
Eff2＞R
Eff1Wish that then the first air station STA1 changes to the second access point AP2 (is alternative "Yes" in step 305) with its association from the first access point AP1, and in step 306, according to IEEE 802.11 associated program again, the first air station STA1 correspondingly initiates the change of its association from the first access point AP1 to the second access point AP2.
Under the situation of several other access points of step 302 identification, if judge whether to wish to change related and find to wish to change association then judge when changing to which access point in step 305, calculate and consider the effective speed R of other access point that institute discerns to some extent usually
Eff
Fig. 4 A is the block diagram that schematically illustrates first example embodiment of the air station 400 that is used to realize method shown in Figure 3 according to the present invention.
Except above disclosed demonstration first embodiment of the present invention, also there are several modes that rearrange, revise and replace that disclosed embodiment is provided, thereby produce other embodiments of the invention.
Existence can be used different embodiments of the invention so that collect several different situations that the information of understanding for the improvement of the communication condition that relates to air station (for example radio environment of air station) is provided, the improvement performance that it for example can be used for optimizing near the radio resource operating position of air station and/or the radio communication that relates to air station is provided.As an example, Fig. 5 is the flow chart that is shown in further detail according to second example embodiment of the inventive method.Use first air station such as STA1 attempt to use to set up the sample situation that STA2 among the first basic service sets BSS1 of (DLS) mechanism and second air station such as Fig. 1 sets up direct radio communication this second example embodiment is described at the direct link of the IEEE 802.11e of IEEE 802.11 standards revised edition defined.
In step 501, the first air station STA1 detects for the needs of data passes being given the second air station STA2.Before Data transmission, the first air station STA1 determines whether to wish to use IEEE 802.11e direct link to create a mechanism Data transmission.For example thinking direct link communication than via the communication of the first access point AP1 when more effective (need still less power, high bit rate etc. is provided more), it may be desirable using air station STA1 to communicate by letter with the direct link between the STA2.When the communication performance between the first air station STA1 and the first access point AP1 is poorer than predetermined threshold (for example at power, can keep aspect such as bit rate), for example can triggers for the investigation direct link communication and whether preferably judge.
In step 502, the first air station STA1 carries out frame report radio resource and measures.
In step 503, the result that the report of the first air station STA1 analysis frame is measured.
If measurement result does not comprise the relevant signal quality data of transmission of carrying out with the second air station STA2, perhaps described signal quality data hints that the direct communication between first and second air station is not preferred (is alternative "No" in step 503) for the communication via the first access point AP1, then in step 504, the first air station STA1 is delivered to the second air station STA2 with data via the first access point AP1.
If measurement result comprises the relevant signal quality data of transmission of carrying out with the second air station STA2, and described signal quality data hints that the direct radio communication between first and second air station is preferred (is alternative "Yes" in step 503), promptly is estimated as better performance (for example need still less transmitting power, high bit rate etc. is provided more) is provided for the communication via the first access point AP1, then in step 505, the first air station STA1 initiates to carry out the request that frame report radio resource is measured by the second air station STA2.Therefore, the first air station STA1 prepares to carry out the request that frame report radio resource is measured by the second air station STA2.By to first example embodiment in similar mode, to measure request (being the frame part of corresponding IEEE 802.11k radio resource measurement request management frames) and be included in it has been specified in new data frame subtype, the Frame as " management frames ", and use " 3 address " forms of IEEE 802.11 Frames to measure and ask to be transmitted into the second air station STA2.
In step 506, receive measurement result from the second air station STA2 via the first access point AP1.Even can by the mode similar to the request of measuring with have new data frame subtype, as the Frame of " management frames " and " 3 address " form of IEEE 802.11 Frames, the transmission measurement result.
In step 507, the first air station STA1 analyzes the measurement result that is received.
If measurement result does not comprise the relevant signal quality data of transmission of carrying out with the first air station STA1, perhaps described signal quality data hints that the direct communication between first and second air station is not preferred (is alternative "No" in step 507) for the communication via the first access point AP1, then in step 504, the first air station STA1 passes to the second air station STA2 with data via the first access point AP1.
If it is preferred (is alternative "Yes" in step 507) that the signal quality data that the transmission of carrying out with the first air station STA1 is relevant hints the direct radio communication between first and second air station, then in step 508, create a mechanism according to IEEE 802.11e direct link, the first air station STA1 initiates to set up direct radio communication with the second air station STA2.
In step 509, the direct Radio Communications Link that the first air station STA1 passes through to be set up passes to the second air station STA2 with real data.
Alternative as the trial of the direct link that is initiated to the second air station STA2 when having the data that it need pass to the second air station STA2 at the first air station STA1, can by for (to and/or from) between the first air station STA1 and the second air station STA2 prediction of Data transmission need trigger the trial of initiating direct link in the future.For example, can there be a kind of like this prediction needs in the future for the interconnection of set-top box and one or more television sets/displays.Therefore, according to this alternative, can need trigger step 502-508 by prediction communication in the future.
For can be how between air station that the request radio resource is measured and the air station of serving described request via one or more intermediate wireless station transmission measurement request/reports, have several alternatives.Not that management frames is specified 802.11 Frame subtypes, but can use the escape subtype of another field with definition content type.Another alternative is IEEE802.11k to be measured request/report be encapsulated in IEEE 802.11 Frames, and specifies the expectation recipient who makes measurement request/report can discriminating measurement request/report and the special-purpose EtherType of normal data frame.Another alternative be at first via one or more intermediate wireless station in the air station of request radio resource measurement request and serve between the air station of described request and set up the tunnel, the emission measurement request via described tunnel/report then.
In first example embodiment according to above disclosed air station of the present invention, described identification component 411 and initiation parts 412 are realized by the digital data processing circuit of taking conventional programmable processor form.But in other embodiments, described parts 411-412 can realize by any digital data processing circuit (for example ASIC, discrete logic circuitry etc.) that can carry out the processing related with described parts 411-412.The programmable device of carrying out processing according to the present invention can be exclusively used in this task, perhaps also is used for the processing relevant with other task.
Even use the present invention in conjunction with IEEE 802.11 air station in first example embodiment of the present invention, but the present invention is certainly also applicable to other type air station of supporting according to other type protocol communication.
Claims (14)
1. one kind is used to initiate the method that radio resource is measured in air station (STA1), said method comprising the steps of:
Identification (201) is for carried out the needs that radio resource is measured by second air station (STA2);
Initiate (202) and carry out the request that radio resource is measured by described second air station (STA2),
It is characterized in that, between described air station (STA1) and described second air station (STA2), do not allow between described the related of directly radio communication.
2. the method for claim 1, wherein said identification step comprises following substep: from described air station itself performed or the 3rd air station performed and report to described second air station of identification the result that the last radio resource of described air station measures.
3. as each described method among the claim 1-2, wherein said air station is via the request of at least one intermediate wireless station to the described second air station transmitting radio resource measurement.
4. method as claimed in claim 3, wherein the described request of radio resource measurement is transparent to described at least one intermediate wireless station.
5. method as claimed in claim 4, wherein the described request of radio resource measurement is encapsulated in the Frame that is addressed to described second air station.
6. method as claimed in claim 4, wherein said initiation step comprises following substep: initiate via described at least one intermediate wireless station the tunnel from described air station to described second air station, wherein the described request of radio resource measurement is transmitted into described second air station via described tunnel from described air station.
7. as each described method among the claim 1-6, the described radio resource measurement that wherein said second air station is carried out relates to be analyzed institute and receives radio signals and collect at least one item in the business statistics.
8. air station (400) that is used for radio communications system, described air station comprises:
Identification component (411) is used to discern for carried out the needs that radio resource is measured by second air station;
Initiate parts (411), can be operationally connected to described identification component, be used to initiate to carry out the request that radio resource is measured by described second air station,
It is characterized in that, between described air station and described second air station, do not allow between described the related of directly radio communication.
9. air station as claimed in claim 8, wherein said identification component be suitable for from described air station itself performed or the 3rd air station performed and report to described second air station of identification the result that the last radio resource of described air station measures.
10. as each described air station among the claim 8-9, wherein said initiation parts are suitable for initiating via the request of at least one intermediate wireless station to the described second air station transmitting radio resource measurement.
11. air station as claimed in claim 10, wherein the described request of radio resource measurement is transparent to described at least one intermediate wireless station.
12. air station as claimed in claim 11, wherein the described request of radio resource measurement is encapsulated in the Frame that is addressed to described second air station.
13. air station as claimed in claim 11, wherein said initiation parts are suitable for initiating via described at least one intermediate wireless station the tunnel from described air station to described second air station, and the described request of wherein radio resource measurement is transmitted into described second air station via described tunnel from described air station.
14. as each described air station among the claim 8-13, wherein said radio communications system is a WLAN (wireless local area network).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SE2005/001831 WO2007067099A1 (en) | 2005-12-05 | 2005-12-05 | A wireless station and method in a wireless station for initiating resource measuremets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101326761A true CN101326761A (en) | 2008-12-17 |
| CN101326761B CN101326761B (en) | 2010-09-29 |
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| CN200580052234XA Expired - Fee Related CN101326761B (en) | 2005-12-05 | 2005-12-05 | Wireless table and method for initiating resource measurement in wireless table |
Country Status (4)
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|---|---|
| US (1) | US8594581B2 (en) |
| EP (1) | EP1958376B1 (en) |
| CN (1) | CN101326761B (en) |
| WO (1) | WO2007067099A1 (en) |
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| US20070097934A1 (en) | 2005-11-03 | 2007-05-03 | Jesse Walker | Method and system of secured direct link set-up (DLS) for wireless networks |
| US8077683B2 (en) | 2005-11-03 | 2011-12-13 | Interdigital Technology Corporation | Method and system for performing peer-to-peer communication between stations within a basic service set |
| US20110223953A1 (en) * | 2010-03-15 | 2011-09-15 | Lg Electronics Inc. | Apparatus for direct communication in a wireless system and method thereof |
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| US9210731B2 (en) * | 2011-07-25 | 2015-12-08 | Qualcomm Incorporated | Direct link setup through an extended service set |
| US9374717B2 (en) * | 2012-03-19 | 2016-06-21 | Qualcomm Incorporated | Transmitting indication of access point loading |
| CN104871573A (en) * | 2012-12-21 | 2015-08-26 | 诺基亚技术有限公司 | Methods and apparatuses for efficient signaling in a system supporting d2d over the air discovery |
| US9743432B2 (en) | 2013-09-23 | 2017-08-22 | Qualcomm Incorporated | LTE-U uplink waveform and variable multi-subframe scheduling |
| US20170064583A1 (en) * | 2014-03-05 | 2017-03-02 | Interdigital Patent Holdings, Inc. | Pcp handover in a mesh network after a change of role of a station associated with a first node receiving from another node an indication of association |
| US9578576B2 (en) * | 2014-07-11 | 2017-02-21 | Sony Corporation | Control of offloading for device-to-device traffic in a cellular network |
| US10211901B2 (en) * | 2014-09-11 | 2019-02-19 | Interdigital Patent Holdings, Inc. | Wireless communications method and apparatus for spatial sharing using carrier sense multiple access wireless medium access |
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| US8787988B2 (en) * | 2003-01-29 | 2014-07-22 | Intellectual Ventures I Llc | Power management for wireless direct link |
| US20040037257A1 (en) * | 2002-08-23 | 2004-02-26 | Koninklijke Philips Electronics N.V. | Method and apparatus for assuring quality of service in wireless local area networks |
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| US7869809B2 (en) * | 2005-05-13 | 2011-01-11 | Intel Corporation | Radio resource measurement and estimation |
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- 2005-12-05 WO PCT/SE2005/001831 patent/WO2007067099A1/en active Application Filing
- 2005-12-05 US US12/095,935 patent/US8594581B2/en active Active
- 2005-12-05 CN CN200580052234XA patent/CN101326761B/en not_active Expired - Fee Related
- 2005-12-05 EP EP05812825.7A patent/EP1958376B1/en not_active Not-in-force
Also Published As
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| EP1958376A1 (en) | 2008-08-20 |
| EP1958376A4 (en) | 2012-11-14 |
| US8594581B2 (en) | 2013-11-26 |
| US20080305744A1 (en) | 2008-12-11 |
| WO2007067099A1 (en) | 2007-06-14 |
| EP1958376B1 (en) | 2016-10-26 |
| CN101326761B (en) | 2010-09-29 |
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